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x2 + 9 + 20 = x2 + 29, and can not be factored.

I assume though that you mis-wrote your question, and what you in fact want to ask is how to factor x2 + 9x + 20.

In that case, the answer is (x + 4)(x + 5).

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14y ago
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Q: Factor x2 plus 9 plus 20?
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